package org.yunai.protobuf.base;

import java.io.UnsupportedEncodingException;

class Bits {

    /*
    * Methods for unpacking primitive values from byte arrays starting at
    * given offsets.
    */
    static boolean getBoolean(byte[] b, int off) {
        return b[off] != 0;
    }

    static char getChar(byte[] b, int off) {
        return (char) (((b[off + 1] & 0xFF)) +
                ((b[off]) << 8));
    }

    static short getShort(byte[] b, int off) {
        return (short) (((b[off + 1] & 0xFF)) +
                ((b[off]) << 8));
    }

    static int getInt(byte[] b, int off) {
        return ((b[off + 3] & 0xFF)) +
                ((b[off + 2] & 0xFF) << 8) +
                ((b[off + 1] & 0xFF) << 16) +
                ((b[off]) << 24);
    }

    static float getFloat(byte[] b, int off) {
        int i = ((b[off + 3] & 0xFF)) +
                ((b[off + 2] & 0xFF) << 8) +
                ((b[off + 1] & 0xFF) << 16) +
                ((b[off]) << 24);
        return Float.intBitsToFloat(i);
    }

    static long getLong(byte[] b, int off) {
        return ((b[off + 7] & 0xFFL)) +
                ((b[off + 6] & 0xFFL) << 8) +
                ((b[off + 5] & 0xFFL) << 16) +
                ((b[off + 4] & 0xFFL) << 24) +
                ((b[off + 3] & 0xFFL) << 32) +
                ((b[off + 2] & 0xFFL) << 40) +
                ((b[off + 1] & 0xFFL) << 48) +
                (((long) b[off]) << 56);
    }

    static double getDouble(byte[] b, int off) {
        long j = ((b[off + 7] & 0xFFL)) +
                ((b[off + 6] & 0xFFL) << 8) +
                ((b[off + 5] & 0xFFL) << 16) +
                ((b[off + 4] & 0xFFL) << 24) +
                ((b[off + 3] & 0xFFL) << 32) +
                ((b[off + 2] & 0xFFL) << 40) +
                ((b[off + 1] & 0xFFL) << 48) +
                (((long) b[off]) << 56);
        return Double.longBitsToDouble(j);
    }

    static String getString(byte[] b, int off, short len) {
        byte[] strBytes = new byte[len];
        System.arraycopy(b, off, strBytes, 0, len);
        return new String(strBytes);
    }

    /*
    * Methods for packing primitive values into byte arrays starting at given
    * offsets.
    */
    static void putBoolean(byte[] b, int off, boolean val) {
        b[off] = (byte) (val ? 1 : 0);
    }

    static void putChar(byte[] b, int off, char val) {
        b[off + 1] = (byte) (val);
        b[off] = (byte) (val >>> 8);
    }

    static void putShort(byte[] b, int off, short val) {
        b[off + 1] = (byte) (val);
        b[off] = (byte) (val >>> 8);
    }

    static void putInt(byte[] b, int off, int val) {
        b[off + 3] = (byte) (val);
        b[off + 2] = (byte) (val >>> 8);
        b[off + 1] = (byte) (val >>> 16);
        b[off] = (byte) (val >>> 24);
    }

    static void putFloat(byte[] b, int off, float val) {
        int i = Float.floatToIntBits(val);
        b[off + 3] = (byte) (i);
        b[off + 2] = (byte) (i >>> 8);
        b[off + 1] = (byte) (i >>> 16);
        b[off] = (byte) (i >>> 24);
    }

    static void putLong(byte[] b, int off, long val) {
        b[off + 7] = (byte) (val);
        b[off + 6] = (byte) (val >>> 8);
        b[off + 5] = (byte) (val >>> 16);
        b[off + 4] = (byte) (val >>> 24);
        b[off + 3] = (byte) (val >>> 32);
        b[off + 2] = (byte) (val >>> 40);
        b[off + 1] = (byte) (val >>> 48);
        b[off] = (byte) (val >>> 56);
    }

    static void putDouble(byte[] b, int off, double val) {
        long j = Double.doubleToLongBits(val);
        b[off + 7] = (byte) (j);
        b[off + 6] = (byte) (j >>> 8);
        b[off + 5] = (byte) (j >>> 16);
        b[off + 4] = (byte) (j >>> 24);
        b[off + 3] = (byte) (j >>> 32);
        b[off + 2] = (byte) (j >>> 40);
        b[off + 1] = (byte) (j >>> 48);
        b[off] = (byte) (j >>> 56);
    }

    static byte[] convertString(String str) {
        try {
            return str.getBytes("utf8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return null;
    }

    static void putString(byte[] b, int off, byte[] strBytes) {
        for (int i = 0, len = strBytes.length; i < len; i++) {
            b[off + i] = strBytes[i];
        }
    }
}
